package com.xms.utils;

import java.security.MessageDigest;

/**
 * MD5 工具类-建议添油加醋的对入参 str 改造一下
 *
 * @author liwucai
 */
public class MD5Util {

  //工具类不允许被实例化
  private MD5Util() throws Exception {
    throw new Exception("异常");
  }

  public static String encode(String str) {
    MessageDigest md5 = null;
    try {
      md5 = MessageDigest.getInstance("MD5");
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
    char[] charArray = str.toCharArray();
    byte[] byteArray = new byte[charArray.length];

    for (int i = 0; i < charArray.length; i++)
      byteArray[i] = (byte) charArray[i];
    byte[] md5Bytes = md5.digest(byteArray);
    StringBuffer hexValue = new StringBuffer();
    for (int i = 0; i < md5Bytes.length; i++) {
      int val = ((int) md5Bytes[i]) & 0xff;
      if (val < 16) {
        hexValue.append("0");
      }

      hexValue.append(Integer.toHexString(val));
    }
    return hexValue.toString();
  }

  public static void main(String[] args) {
    System.out.println(encode("123456"));
  }
}
